From 827b7b903abc07d5fb04591bbae5587e6dc44993 Mon Sep 17 00:00:00 2001
From: Scott Moser <smoser@ubuntu.com>
Date: Wed, 12 Aug 2015 12:51:39 -0400
Subject: swap: create swap with fallocate if possible

fallocate is much faster than 'dd' for creating and initializing a
swap file.

LP: #1482994
---
 cloudinit/config/cc_mounts.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'cloudinit')

diff --git a/cloudinit/config/cc_mounts.py b/cloudinit/config/cc_mounts.py
index 73b42f91..47b63dfc 100644
--- a/cloudinit/config/cc_mounts.py
+++ b/cloudinit/config/cc_mounts.py
@@ -206,7 +206,8 @@ def setup_swapfile(fname, size=None, maxsize=None):
         util.log_time(LOG.debug, msg, func=util.subp,
             args=[['sh', '-c',
                    ('rm -f "$1" && umask 0066 && '
-                    'dd if=/dev/zero "of=$1" bs=1M "count=$2" && '
+                    '{ fallocate -l "${2}M" "$1" || '
+                    '  dd if=/dev/zero "of=$1" bs=1M "count=$2"; } && '
                     'mkswap "$1" || { r=$?; rm -f "$1"; exit $r; }'),
                    'setup_swap', fname, mbsize]])
 
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